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The Mobipocket source is OeB format so it is XHTML. The content of the book is slightly altered to suit the needs of the Reader program. Mainly the image tags are changed to contain a number attribute and the anchor tags to contain an attribute giving the file offset to the anchor destination.
The .prc file can be compressed in several ways. Standard Palm compression which is documented. Such books can be reverted to source. Usually the books are compressed in the proprietary Mobipocket compression.
The DRM is probably simply an encryption using the PID as key.
The current .mobi format is only different in some details.
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